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Talc-Pyrophyllite group [abbr. Tlc-Prl ]

[ A⁶⁺ ][(OH)₂|(Si₂O₅)₂]

• Class: No interlayer < 2:1 layer < Planar hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllosilicate - Hydroxide
• System: Monoclinic, Triclinic

Trioctahedral

[ Fe²⁺₃]: Minnesotaite

[ Mg²⁺₃]: Talc

[ Ni²⁺₃]: Willemseite

Dioctahedral

[ Fe³⁺₂]: Ferripyrophyllite

[ Al³⁺₂]: Pyrophyllite

[ (Na,Al)₂]: Brinrobertsite